/*
 * Copyright (C) OpenTX
 *
 * Based on code named
 *   th9x - http://code.google.com/p/th9x
 *   er9x - http://code.google.com/p/er9x
 *   gruvin9x - http://code.google.com/p/gruvin9x
 *
 * License GPLv2: http://www.gnu.org/licenses/gpl-2.0.html
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 */

#include "opentx.h"

void extmoduleSendNextFrame();

void extmoduleStop()
{
  NVIC_DisableIRQ(EXTMODULE_TIMER_DMA_STREAM_IRQn);
  NVIC_DisableIRQ(EXTMODULE_TIMER_CC_IRQn);
  EXTMODULE_TIMER_DMA_STREAM->CR &= ~DMA_SxCR_EN; // Disable DMA

#if defined(EXTMODULE_USART)
  NVIC_DisableIRQ(EXTMODULE_USART_DMA_STREAM_IRQn);
  EXTMODULE_USART_DMA_STREAM->CR &= ~DMA_SxCR_EN; // Disable DMA
#endif

  EXTMODULE_TIMER->DIER &= ~(TIM_DIER_CC2IE | TIM_DIER_UDE);
  EXTMODULE_TIMER->CR1 &= ~TIM_CR1_CEN;

  if (!IS_TRAINER_EXTERNAL_MODULE()) {
    EXTERNAL_MODULE_OFF();
  }
}

void extmoduleNoneStart()
{
  if (!IS_TRAINER_EXTERNAL_MODULE()) {
    EXTERNAL_MODULE_OFF();
  }

  GPIO_PinAFConfig(EXTMODULE_TX_GPIO, EXTMODULE_TX_GPIO_PinSource, 0);

  GPIO_InitTypeDef GPIO_InitStructure;
  GPIO_InitStructure.GPIO_Pin = EXTMODULE_TX_GPIO_PIN;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_Init(EXTMODULE_TX_GPIO, &GPIO_InitStructure);
  GPIO_SetBits(EXTMODULE_TX_GPIO, EXTMODULE_TX_GPIO_PIN); // Set high

  EXTMODULE_TIMER->CR1 &= ~TIM_CR1_CEN;
  EXTMODULE_TIMER->PSC = EXTMODULE_TIMER_FREQ / 2000000 - 1; // 0.5uS from 30MHz
  EXTMODULE_TIMER->ARR = 36000; // 18mS
  EXTMODULE_TIMER->CCR2 = 32000; // Update time
  EXTMODULE_TIMER->EGR = 1; // Restart
  EXTMODULE_TIMER->SR &= ~TIM_SR_CC2IF;
  EXTMODULE_TIMER->DIER |= TIM_DIER_CC2IE; // Enable this interrupt
  EXTMODULE_TIMER->CR1 |= TIM_CR1_CEN;

  NVIC_EnableIRQ(EXTMODULE_TIMER_CC_IRQn);
  NVIC_SetPriority(EXTMODULE_TIMER_CC_IRQn, 7);
}

void extmodulePpmStart()
{
  EXTERNAL_MODULE_ON();

  GPIO_PinAFConfig(EXTMODULE_TX_GPIO, EXTMODULE_TX_GPIO_PinSource, EXTMODULE_TIMER_TX_GPIO_AF);

  GPIO_InitTypeDef GPIO_InitStructure;
  GPIO_InitStructure.GPIO_Pin = EXTMODULE_TX_GPIO_PIN;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_Init(EXTMODULE_TX_GPIO, &GPIO_InitStructure);

  EXTMODULE_TIMER->CR1 &= ~TIM_CR1_CEN;
  EXTMODULE_TIMER->PSC = EXTMODULE_TIMER_FREQ / 2000000 - 1; // 0.5uS from 30MHz
  EXTMODULE_TIMER->ARR = 45000;
  EXTMODULE_TIMER->CCR1 = GET_PPM_DELAY(EXTERNAL_MODULE)*2;
  EXTMODULE_TIMER->CCER = EXTMODULE_TIMER_OUTPUT_ENABLE | (GET_PPM_POLARITY(EXTERNAL_MODULE) ? EXTMODULE_TIMER_OUTPUT_POLARITY : 0); //     // we are using complementary output so logic has to be reversed here
  EXTMODULE_TIMER->BDTR = TIM_BDTR_MOE;
  EXTMODULE_TIMER->CCMR1 = TIM_CCMR1_OC1M_2 | TIM_CCMR1_OC1M_0; // Force O/P high
  EXTMODULE_TIMER->EGR = 1;
  EXTMODULE_TIMER->DIER |= TIM_DIER_UDE;
  EXTMODULE_TIMER->CCMR1 = TIM_CCMR1_OC1M_1 | TIM_CCMR1_OC1M_2 | TIM_CCMR1_OC2PE; // PWM mode 1
  EXTMODULE_TIMER->CR1 |= TIM_CR1_CEN;

  extmoduleSendNextFrame();

  NVIC_EnableIRQ(EXTMODULE_TIMER_DMA_STREAM_IRQn);
  NVIC_SetPriority(EXTMODULE_TIMER_DMA_STREAM_IRQn, 7);
  NVIC_EnableIRQ(EXTMODULE_TIMER_CC_IRQn);
  NVIC_SetPriority(EXTMODULE_TIMER_CC_IRQn, 7);
}

void extmoduleSerialStart(uint32_t /*baudrate*/, uint32_t period_half_us)
{
  EXTERNAL_MODULE_ON();

  GPIO_PinAFConfig(EXTMODULE_TX_GPIO, EXTMODULE_TX_GPIO_PinSource, EXTMODULE_TIMER_TX_GPIO_AF);

  GPIO_InitTypeDef GPIO_InitStructure;
  GPIO_InitStructure.GPIO_Pin = EXTMODULE_TX_GPIO_PIN;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_Init(EXTMODULE_TX_GPIO, &GPIO_InitStructure);

  EXTMODULE_TIMER->CR1 &= ~TIM_CR1_CEN;
  EXTMODULE_TIMER->PSC = EXTMODULE_TIMER_FREQ / 2000000 - 1; // 0.5uS from 30MHz
  EXTMODULE_TIMER->ARR = period_half_us;
  EXTMODULE_TIMER->CCER = EXTMODULE_TIMER_OUTPUT_ENABLE | EXTMODULE_TIMER_OUTPUT_POLARITY;
  EXTMODULE_TIMER->BDTR = TIM_BDTR_MOE; // Enable outputs
  EXTMODULE_TIMER->CCR1 = 0;
  EXTMODULE_TIMER->CCMR1 = TIM_CCMR1_OC1M_2 | TIM_CCMR1_OC1M_0; // Force O/P high
  EXTMODULE_TIMER->EGR = 1; // Restart
  EXTMODULE_TIMER->DIER |= TIM_DIER_UDE; // Enable DMA on update
  EXTMODULE_TIMER->CCMR1 = TIM_CCMR1_OC1M_1 | TIM_CCMR1_OC1M_0;
  EXTMODULE_TIMER->CR1 |= TIM_CR1_CEN;

  extmoduleSendNextFrame();

  NVIC_EnableIRQ(EXTMODULE_TIMER_DMA_STREAM_IRQn);
  NVIC_SetPriority(EXTMODULE_TIMER_DMA_STREAM_IRQn, 7);
  NVIC_EnableIRQ(EXTMODULE_TIMER_CC_IRQn);
  NVIC_SetPriority(EXTMODULE_TIMER_CC_IRQn, 7);
}

#if defined(EXTMODULE_USART)
void extmoduleInvertedSerialStart(uint32_t baudrate, uint32_t period_half_us)
{
  EXTERNAL_MODULE_ON();

  NVIC_InitTypeDef NVIC_InitStructure;
  NVIC_InitStructure.NVIC_IRQChannel = EXTMODULE_USART_DMA_STREAM_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; /* Not used as 4 bits are used for the pre-emption priority. */;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);

  // TX Pin
  GPIO_PinAFConfig(EXTMODULE_TX_GPIO, EXTMODULE_TX_GPIO_PinSource, EXTMODULE_USART_TX_GPIO_AF);

  GPIO_InitTypeDef GPIO_InitStructure;
  GPIO_InitStructure.GPIO_Pin = EXTMODULE_TX_GPIO_PIN;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
  GPIO_Init(EXTMODULE_TX_GPIO, &GPIO_InitStructure);

#if 0
  // RX Pin
  GPIO_PinAFConfig(EXTMODULE_RX_GPIO, EXTMODULE_RX_GPIO_PinSource, EXTMODULE_TX_GPIO_USART_AF);
  GPIO_InitStructure.GPIO_Pin = EXTMODULE_RX_GPIO_PIN;
  GPIO_Init(EXTMODULE_RX_GPIO, &GPIO_InitStructure);
#endif

  // UART config
  USART_DeInit(EXTMODULE_USART);
  USART_InitTypeDef USART_InitStructure;
  USART_InitStructure.USART_BaudRate = baudrate;
  USART_InitStructure.USART_Parity = USART_Parity_No;
  USART_InitStructure.USART_StopBits = USART_StopBits_1;
  USART_InitStructure.USART_WordLength = USART_WordLength_8b;
  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
  USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
  USART_Init(EXTMODULE_USART, &USART_InitStructure);
  USART_Cmd(EXTMODULE_USART, ENABLE);

  // Timer
  EXTMODULE_TIMER->CR1 &= ~TIM_CR1_CEN;
  EXTMODULE_TIMER->PSC = EXTMODULE_TIMER_FREQ / 2000000 - 1; // 0.5uS from 30MHz
  EXTMODULE_TIMER->ARR = period_half_us;
  EXTMODULE_TIMER->CCR2 = period_half_us - 2000; // Update time
  EXTMODULE_TIMER->EGR = 1; // Restart
  EXTMODULE_TIMER->SR &= ~TIM_SR_CC2IF;
  EXTMODULE_TIMER->DIER |= TIM_DIER_CC2IE; // Enable this interrupt
  EXTMODULE_TIMER->CR1 |= TIM_CR1_CEN;

  NVIC_EnableIRQ(EXTMODULE_TIMER_CC_IRQn);
  NVIC_SetPriority(EXTMODULE_TIMER_CC_IRQn, 7);
}

void extmodulePxxStart()
{
  extmoduleInvertedSerialStart(EXTMODULE_USART_PXX_BAUDRATE, PXX_PERIOD_HALF_US);
}
#else
void extmodulePxxStart()
{
  EXTERNAL_MODULE_ON();

  GPIO_PinAFConfig(EXTMODULE_TX_GPIO, EXTMODULE_TX_GPIO_PinSource, EXTMODULE_TIMER_TX_GPIO_AF);

  GPIO_InitTypeDef GPIO_InitStructure;
  GPIO_InitStructure.GPIO_Pin = EXTMODULE_TX_GPIO_PIN;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_Init(EXTMODULE_TX_GPIO, &GPIO_InitStructure);

  EXTMODULE_TIMER->CR1 &= ~TIM_CR1_CEN;
  EXTMODULE_TIMER->PSC = EXTMODULE_TIMER_FREQ / 2000000 - 1; // 0.5uS (2Mhz)
  EXTMODULE_TIMER->ARR = PXX_PERIOD_HALF_US;
  EXTMODULE_TIMER->CCER = EXTMODULE_TIMER_OUTPUT_ENABLE | EXTMODULE_TIMER_OUTPUT_POLARITY; // polarity, default low
  EXTMODULE_TIMER->BDTR = TIM_BDTR_MOE; // Enable outputs
  EXTMODULE_TIMER->CCR1 = 18;
  EXTMODULE_TIMER->CCMR1 = TIM_CCMR1_OC1M_2 | TIM_CCMR1_OC1M_0; // Force O/P high
  EXTMODULE_TIMER->EGR = 1; // Restart
  EXTMODULE_TIMER->DIER |= TIM_DIER_UDE; // Enable DMA on update
  EXTMODULE_TIMER->CCMR1 = TIM_CCMR1_OC1M_1 | TIM_CCMR1_OC1M_2;
  EXTMODULE_TIMER->CR1 |= TIM_CR1_CEN;

  extmoduleSendNextFrame();

  NVIC_EnableIRQ(EXTMODULE_TIMER_DMA_STREAM_IRQn);
  NVIC_SetPriority(EXTMODULE_TIMER_DMA_STREAM_IRQn, 7);
  NVIC_EnableIRQ(EXTMODULE_TIMER_CC_IRQn);
  NVIC_SetPriority(EXTMODULE_TIMER_CC_IRQn, 7);
}
#endif

void extmoduleCrossfireStart()
{
  EXTERNAL_MODULE_ON();

  GPIO_PinAFConfig(EXTMODULE_TX_GPIO, EXTMODULE_TX_GPIO_PinSource, 0);

  GPIO_InitTypeDef GPIO_InitStructure;
  GPIO_InitStructure.GPIO_Pin = EXTMODULE_TX_GPIO_PIN;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_Init(EXTMODULE_TX_GPIO, &GPIO_InitStructure);
  GPIO_SetBits(EXTMODULE_TX_GPIO, EXTMODULE_TX_GPIO_PIN); // Set high

  EXTMODULE_TIMER->CR1 &= ~TIM_CR1_CEN;
  EXTMODULE_TIMER->PSC = EXTMODULE_TIMER_FREQ / 2000000 - 1; // 0.5uS from 30MHz
  EXTMODULE_TIMER->ARR = (2000 * CROSSFIRE_PERIOD);
  EXTMODULE_TIMER->CCR2 = (2000 * CROSSFIRE_PERIOD) - 1000;
  EXTMODULE_TIMER->EGR = 1; // Restart
  EXTMODULE_TIMER->SR &= ~TIM_SR_CC2IF;
  EXTMODULE_TIMER->DIER |= TIM_DIER_CC2IE; // Enable this interrupt
  EXTMODULE_TIMER->CR1 |= TIM_CR1_CEN;

  NVIC_EnableIRQ(EXTMODULE_TIMER_CC_IRQn);
  NVIC_SetPriority(EXTMODULE_TIMER_CC_IRQn, 7);
}

void extmoduleSendNextFrame()
{
  if (s_current_protocol[EXTERNAL_MODULE] == PROTO_PPM) {
    EXTMODULE_TIMER->CCR1 = GET_PPM_DELAY(EXTERNAL_MODULE)*2;
    EXTMODULE_TIMER->CCER = EXTMODULE_TIMER_OUTPUT_ENABLE | (GET_PPM_POLARITY(EXTERNAL_MODULE) ? EXTMODULE_TIMER_OUTPUT_POLARITY : 0); //     // we are using complementary output so logic has to be reversed here
    EXTMODULE_TIMER->CCR2 = *(modulePulsesData[EXTERNAL_MODULE].ppm.ptr - 1) - 4000; // 2mS in advance
    EXTMODULE_TIMER_DMA_STREAM->CR &= ~DMA_SxCR_EN; // Disable DMA
    EXTMODULE_TIMER_DMA_STREAM->CR |= EXTMODULE_TIMER_DMA_CHANNEL | DMA_SxCR_DIR_0 | DMA_SxCR_MINC | DMA_SxCR_PSIZE_0 | DMA_SxCR_MSIZE_0 | DMA_SxCR_PL_0 | DMA_SxCR_PL_1;
    EXTMODULE_TIMER_DMA_STREAM->PAR = CONVERT_PTR_UINT(&EXTMODULE_TIMER->ARR);
    EXTMODULE_TIMER_DMA_STREAM->M0AR = CONVERT_PTR_UINT(modulePulsesData[EXTERNAL_MODULE].ppm.pulses);
    EXTMODULE_TIMER_DMA_STREAM->NDTR = modulePulsesData[EXTERNAL_MODULE].ppm.ptr - modulePulsesData[EXTERNAL_MODULE].ppm.pulses;
    EXTMODULE_TIMER_DMA_STREAM->CR |= DMA_SxCR_EN | DMA_SxCR_TCIE; // Enable DMA
  }
  else if (s_current_protocol[EXTERNAL_MODULE] == PROTO_PXX) {
#if defined(EXTMODULE_USART)
    DMA_InitTypeDef DMA_InitStructure;
    DMA_DeInit(EXTMODULE_USART_DMA_STREAM);
    DMA_InitStructure.DMA_Channel = EXTMODULE_USART_DMA_CHANNEL;
    DMA_InitStructure.DMA_PeripheralBaseAddr = CONVERT_PTR_UINT(&EXTMODULE_USART->DR);
    DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;
    DMA_InitStructure.DMA_Memory0BaseAddr = CONVERT_PTR_UINT(modulePulsesData[EXTERNAL_MODULE].pxx_uart.pulses);
    DMA_InitStructure.DMA_BufferSize = modulePulsesData[EXTERNAL_MODULE].pxx_uart.ptr - modulePulsesData[EXTERNAL_MODULE].pxx_uart.pulses;
    DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
    DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
    DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
    DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
    DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
    DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh;
    DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
    DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
    DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
    DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
    DMA_Init(EXTMODULE_USART_DMA_STREAM, &DMA_InitStructure);
    DMA_Cmd(EXTMODULE_USART_DMA_STREAM, ENABLE);
    USART_DMACmd(EXTMODULE_USART, USART_DMAReq_Tx, ENABLE);
    EXTMODULE_TIMER->DIER |= TIM_DIER_CC2IE;
#else
    EXTMODULE_TIMER->CCR2 = *(modulePulsesData[EXTERNAL_MODULE].pxx.ptr - 1) - 4000; // 2mS in advance
    EXTMODULE_TIMER_DMA_STREAM->CR &= ~DMA_SxCR_EN; // Disable DMA
    EXTMODULE_TIMER_DMA_STREAM->CR |= EXTMODULE_TIMER_DMA_CHANNEL | DMA_SxCR_DIR_0 | DMA_SxCR_MINC | DMA_SxCR_PSIZE_0 | DMA_SxCR_MSIZE_0 | DMA_SxCR_PL_0 | DMA_SxCR_PL_1;
    EXTMODULE_TIMER_DMA_STREAM->PAR = CONVERT_PTR_UINT(&EXTMODULE_TIMER->ARR);
    EXTMODULE_TIMER_DMA_STREAM->M0AR = CONVERT_PTR_UINT(modulePulsesData[EXTERNAL_MODULE].pxx.pulses);
    EXTMODULE_TIMER_DMA_STREAM->NDTR = modulePulsesData[EXTERNAL_MODULE].pxx.ptr - modulePulsesData[EXTERNAL_MODULE].pxx.pulses;
    EXTMODULE_TIMER_DMA_STREAM->CR |= DMA_SxCR_EN | DMA_SxCR_TCIE; // Enable DMA
#endif
  }
  else if (IS_DSM2_PROTOCOL(s_current_protocol[EXTERNAL_MODULE]) || IS_MULTIMODULE_PROTOCOL(s_current_protocol[EXTERNAL_MODULE]) || IS_SBUS_PROTOCOL(s_current_protocol[EXTERNAL_MODULE])) {
    if (IS_SBUS_PROTOCOL(s_current_protocol[EXTERNAL_MODULE]))
      EXTMODULE_TIMER->CCER = EXTMODULE_TIMER_OUTPUT_ENABLE | (GET_SBUS_POLARITY(EXTERNAL_MODULE) ? EXTMODULE_TIMER_OUTPUT_POLARITY : 0); // reverse polarity for Sbus if needed
    EXTMODULE_TIMER->CCR2 = *(modulePulsesData[EXTERNAL_MODULE].dsm2.ptr - 1) - 4000; // 2mS in advance
    EXTMODULE_TIMER_DMA_STREAM->CR &= ~DMA_SxCR_EN; // Disable DMA
    EXTMODULE_TIMER_DMA_STREAM->CR |= EXTMODULE_TIMER_DMA_CHANNEL | DMA_SxCR_DIR_0 | DMA_SxCR_MINC | DMA_SxCR_PSIZE_0 | DMA_SxCR_MSIZE_0 | DMA_SxCR_PL_0 | DMA_SxCR_PL_1;
    EXTMODULE_TIMER_DMA_STREAM->PAR = CONVERT_PTR_UINT(&EXTMODULE_TIMER->ARR);
    EXTMODULE_TIMER_DMA_STREAM->M0AR = CONVERT_PTR_UINT(modulePulsesData[EXTERNAL_MODULE].dsm2.pulses);
    EXTMODULE_TIMER_DMA_STREAM->NDTR = modulePulsesData[EXTERNAL_MODULE].dsm2.ptr - modulePulsesData[EXTERNAL_MODULE].dsm2.pulses;
    EXTMODULE_TIMER_DMA_STREAM->CR |= DMA_SxCR_EN | DMA_SxCR_TCIE; // Enable DMA
  }
  else {
    EXTMODULE_TIMER->DIER |= TIM_DIER_CC2IE;
  }
}

extern "C" void EXTMODULE_TIMER_DMA_STREAM_IRQHandler()
{
  if (!DMA_GetITStatus(EXTMODULE_TIMER_DMA_STREAM, EXTMODULE_TIMER_DMA_FLAG_TC))
    return;

  DMA_ClearITPendingBit(EXTMODULE_TIMER_DMA_STREAM, EXTMODULE_TIMER_DMA_FLAG_TC);

  EXTMODULE_TIMER->SR &= ~TIM_SR_CC2IF; // Clear flag
  EXTMODULE_TIMER->DIER |= TIM_DIER_CC2IE; // Enable this interrupt
}

extern "C" void EXTMODULE_TIMER_CC_IRQHandler()
{
  EXTMODULE_TIMER->DIER &= ~TIM_DIER_CC2IE; // Stop this interrupt
  EXTMODULE_TIMER->SR &= ~TIM_SR_CC2IF;
  setupPulses(EXTERNAL_MODULE);
  extmoduleSendNextFrame();
}